Innovative static spectropolarimeter concept for wide spectral ranges: tolerancing study
Authors: Martin Pertenais, Coralie Neiner, Laurent Parès, Pascal Petit
AI-generated Key Points
- Development of an efficient and robust polarimeter for wide spectral ranges and space applications is crucial
- Researchers in the UVMag consortium are exploring an innovative concept of a polarimeter that is simple, effective, and can operate over a wide spectral range
- The idea is based on the use of polarization scramblers to create a spatial modulation of polarization
- Variation in thickness of birefringent material generates intensity modulation of light related to entrance polarization state, enabling measurement of full Stokes vector over entire spectrum with single-shot measurement without any moving parts
- Detailed tolerancing study on the optical bench using this spectropolarimeter after introducing its concept and optical design has been conducted
- Proposed static spectropolarimeter concept offers several advantages over traditional methods including simplicity, efficiency, and robustness across wide spectral ranges suitable for space applications like Arago mission proposed to ESA.
Abstract: Developing an efficient and robust polarimeter for wide spectral ranges and space applications is a main issue in many projects. As part of the UVMag consortium created to develop UV facilities in space (e.g. the Arago mission proposed to ESA), we are studying an innovative concept of polarimeter that is robust, simple, and efficient on a wide spectral range. The idea, based on the article by Sparks et al. (2012), is to use polarization scramblers to create a spatial modulation of the polarization. Along the height of the wedges of the scramblers, the thickness of the birefringent material crossed by the light, and thus the retardance, vary continuously. This variation creates an intensity modulation of the light related to the entrance polarization state. Analyzing this modulation with a linear polarizer, and dispersing the light spectrally in the orthogonal spatial direction, enables the measurement of the full Stokes vector over the entire spectrum. This determination is performed with a single-shot measurement and without any moving parts in the system. After a quick introduction to the concept and optical design, this article presents the tolerancing study of the optical bench using this spectropolarimeter. The impact of different error sources, such as, birefringence uncertainty or decenter of the wedges, is investigated.
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